Spa filter



FIG. 1 is a perspective view of the spa filter;

FIG. 2 is a first end elevational view thereof, with the opposite end being a mirror image thereof;

FIG. 3 is a side elevational view thereof with the opposite side being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for spa filter, as shown and described. 